



YSF20-130 Series Pressure Relief Device
YSF20-130 series pressure relief device is specially developed for offshore wind power transformers or nacelle transformers. Its characteristics are: stable performance, compact structure, high environmental resistance and high corrosion resistance. The valve body, valve cover, and standard parts are all made of 304 or 316 stainless steel. It can also be applied to the pressure release of large oil-immersed power transformers, power capacitors, reactors and other equipment when the internal pressure of the oil tank is over pressured.
1. Installation position: on the oil tank cap, on the raised seat or on the upper side wall of the oil tank.
2. Environmental requirements: -30 ℃ to+70 ℃(can be customized according to user needs to support up to -45 ℃ to+70 ℃); Work environment requirements:- 30℃~+125℃(customizable according to user needs, can support up to -45 ℃~+125 ℃).
3. Relative humidity: no more than 95% at +20 °C.
4. Protection level: IP55(Customizable according to user requirements). Scope of application: Altitude 0~4000m.
5. Power frequency withstand voltage: normally open contact 2000V/min, normally closed contact or single pole double throw contact: phase to phase 1000V/min, ground 2000V/min.
6. Insulation performance: normally open contact 2500V, 1000M Ω, normally closed contact or single pole double throw contact: phase to phase 1000V, 500M Ω, ground 2500V, 1000M Ω.

| Color card No | Color | Optionality of choice |
| RAL7035 | Light grey | Default |

| Number | Assembly position | Thread specification | Recommended torque | Assembly tool specifications | Notes | |
| 1 | Connecting terminal | M3 | 0.5~1Nm | ![]() |
![]() |
Suggest manual installation |
| 2 | Terminal box cover | M4 | 1.5~2Nm | ![]() |
PH2 | Suggest manual installation |
| 3 | Flange installation hole | M14 bolt | 55~65Nm | ![]() |
||
| 4 | Directional oil inlet | M12 | 35~40Nm | ![]() |
||
| 5 | Electrical hood | M8 | 11~14Nm | ![]() |
||